Hi Loic, On Mon, 2021-10-18 at 11:59 +0200, Loic Poulain wrote: > Hi Aleksander, > > On Mon, 18 Oct 2021 at 11:14, Aleksander Morgado > <aleksander@xxxxxxxxxxxxx> wrote: > > > > Hey all, > > > > > [ 7.056113] mhi-pci-generic 0000:01:00.0: MHI PCI device found: > > > sierra-em919x > > > [ 7.063298] mhi-pci-generic 0000:01:00.0: BAR 0: assigned [mem > > > 0x600000000-0x600000fff 64bit] > > > [ 7.071846] mhi-pci-generic 0000:01:00.0: enabling device (0000 > > > -> 0002) > > > [ 7.078671] mhi-pci-generic 0000:01:00.0: using shared MSI > > > > In this specific setup we request 4 MSI vectors through > > pci_alloc_irq_vectors(), but only end up allocating a single one > > (i.e. > > mhi_cntrl->nr_irqs = 1). Could that be related to the problem > > somehow? > > It shouldn't, we have the 'shared IRQ' fallback which is used when we > can not setup multiple MSI, and this works with other SDX55 based > modems. > Compared to other SDX55 based modems, EM919x uses the same event ring for the control, the data and the diag, and we use the macro MHI_EVENT_CONFIG_CTRL to configure it. - Perhaps this macro is not suitable in this case? - Could this be explaining, what are we observing? Moreover, we have voluntarily reduced the number of shared MSI vectors to one, on a platform able to provide enough, then we observe the same kind of issues, as on i.MX6DL which end up allocating a single one. However, we carried out this test only with the vendor driver. Best regards, Thomas > Regards, > Loic -- Thomas Perrot, Bootlin Embedded Linux and kernel engineering https://bootlin.com
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